by CludeChn by CludeChn by CludeChn by CludeChn by CludeChn by CludeChn by CludeChn by CludeChn by CludeChn by CludeChn by CludeChn by CludeChn by CludeChn by CludeChn by CludeChn by CludeChn by CludeChn by CludeChn 皋亭山是杭州最古老的山丘,在2.5亿年前后的印支构造期形成了“半山—皋亭山褶皱区”,当时的杭州城区还是一片汪洋大海,此时的皋亭山已兀立在海上。
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